Midnight：在 Mac 本機運行的智能簿記工具

Posted on Nov 1 Edited on Nov 1 AI-assisted

My accounting data lives on my Mac. Not in some cloud.

As a freelancer, I spent a long time looking for a tool that combines invoicing, time tracking, and taxes without a subscription and without storing my financial data on someone else’s servers. I couldn’t find one. So I built it myself.

Midnight is an open-source app for freelancers and self-employed professionals in Germany:

Invoices as PDF, XRechnung, or ZUGFeRD
Time tracking with projects, budgets, and one-click billing
Income, expenses, and receipts tailored to German EÜR accounting
Tax forecasts for the current year
An MCP server that allows AI agents to work directly with your own data

Everything runs locally in an SQLite database. Built with Rust, Tauri, and React.

Features

Area	What it covers
Overview	Income, expenses, profit and open items for the selected period, unbilled time
Income & expenses	Paid invoices as income, expenses with receipts, extracting name, amount and date from PDF receipts, CSV export
Categories	Custom expense categories, pre-filled with typical items for the German EÜR (cash-basis profit statement)
Invoices	Number sequences, line items, VAT and discounts, small business scheme under § 19 UStG, PDF export via LaTeX, e-invoices (ZUGFeRD/Factur-X EN 16931 and XRechnung 3.0), duplicating, saved products
Customers	Customer and order numbers, revenue and tracked time per customer, archive
Time tracking	Projects with hourly rate, budget or fixed price, timer, manual entries, billing unbilled time as a draft invoice, timesheet export
Vault	Document storage with document type, customer and tags, full-text search in PDF text
Reports	Monthly trend, margin, categories, forecast for the next three months

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